Plastic product and manufacturing method therefor
a technology of plastic products and manufacturing methods, applied in the field of plastic products, can solve the problems of difficult to produce parts with complicated configurations, difficult to set the attenuating frequency of parts, and parts tend to become bulky
Inactive Publication Date: 2000-10-03
EBARA CORP
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Since a high pressure rotary machine of this kind normally generates a great amount of vibration and noise, it is necessary for parts of the rotary machine such as a casing and an impeller to have vibration preventing properties and noise attenuation properties.
However, the volume of such part tends to become bulky, and, it is therefore, difficult to produce a part having a complicated configuration due to the poor workability of materials used.
Further, since frequencies for attenuating vibration and noise differ from material to material, it is difficult to set an attenuating frequency for a part.
In this case, if the part has a complicated shape, since a structure of a die for manufacturing the part also becomes complicated, it is very difficult to form the complicated part from the plastic material.
Method used
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Embodiment Construction
The present invention will now be explained in connection with an embodiment thereof with reference to the accompanying drawings. In the illustrated embodiment, a casing of a volute pump is exemplified as a plastic product, and such a casing and manufacturing method therefor will be explained.
FIG. 1 is a sectional view showing a lower casing of the volute pump. As shown, the lower casing 1 comprises an inner core portion 2 made of a plastic material, and a fiber-reinforced plastic layer 3 formed on inner and outer surfaces of the inner core portion 2. As will be descried later, the fiber-reinforced plastic layer 3 is formed from a prepreg material, i.e., laminated molded material in which thermosetting resin is impregnated into a continuous reinforce member such as a mat formed from reinforce fibers such as carbon fiber and glass fibers.
As mentioned above, by closely contacting and adhering the fiber-reinforced plastic layer 3 onto the inner and outer surfaces of the inner core port...
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Abstract
A plastic product comprising an inner core portion made of plastic and having a solid shape or a hollow shape including an internal cavity, and a fiber-reinforced plastic layer formed on inner and / or outer surfaces of the inner core portion, whereby the plastic product has light weight, high strength and excellent vibration suppressing and noise shielding ability.
Description
1. Field of the ArtThe present invention relates to a plastic product such as a pump casing used in a high speed / high pressure rotary machine, and a method for manufacturing such a plastic product.2. Prior ArtSince a high pressure rotary machine of this kind normally generates a great amount of vibration and noise, it is necessary for parts of the rotary machine such as a casing and an impeller to have vibration preventing properties and noise attenuation properties. Conventionally, in order to prevent or attenuate vibration and noise, machine parts have been formed from vibration suppressing materials and / or noise shielding materials. However, the volume of such part tends to become bulky, and, it is therefore, difficult to produce a part having a complicated configuration due to the poor workability of materials used. Further, since frequencies for attenuating vibration and noise differ from material to material, it is difficult to set an attenuating frequency for a part.Further, ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B29C70/04B29C70/08B29C67/00B29C70/34B29B15/14F04D29/66B29C69/02B29C70/06B29K101/10B29K105/08B29L24/00B32B5/28C08J5/24
CPCB29C67/0062B29C70/086B29C70/088B29C70/342B29C67/0051Y10T428/24744B29L2031/7498Y10T428/1393Y10T29/49259Y10T428/1362B29L2031/7496B29C64/124B33Y80/00
Inventor TAKAYAMA, HIROKAZUOGAWA, TOSHIYUKI
Owner EBARA CORP